单色透射光谱密度描述黑白负片层次特性的研究

An approach to the determination of the gradation of b/w negative by measuring monochromatic transmission density

讨论了用分光光度计计量黑白负片透射光学密度的方法;数学推导及试验数据均表明:黑白负片的450nm波长单色透射光谱密度值与其透射光学密度值近似相等;分光光度计可用于黑白负片层次特性测定。有利于在我国摄影界推广黑白负片层次特性测定技术,从而使我国的黑白摄影进入高级黑白摄影。

A method for measuring the diffuse transmission density of b/w negtive film by using a spec-trophotometer was studied. Mathematical deduction and testing results both showed that values obtained by measuring with monochromatic light at 150 nm wave length equal approximately that measured with a normal densitometer, thus can be used for determining the gradation of b/w negative-film.